Water-tube boiler.



M. W. SEWALL.

WATER TUBE BOILER.

APPLICATION FILED JUNE 21, 1909.

Patented Mar. 7, 1911.

INVENTOI) WITNESSES mmo'r'r w. SEWALL, or BOSELLE, imw JERSEY,

UNITED STATES PATENT OFFICE.

ASSIGNOR TO THE BABCOGK & WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

WATER-TUBE BOILER.

Specification of Letters ratent.

Patented Mar. 7, 1911.

Application filed lune 21, 1909. Serial No. 503,304.

- To all it may concern:

purities,

Be it known that I, MINOTT vW. SEWALL, a citizen of the United States, residing at Roselle, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Water-Tube Boilers, of which the following is a specification.

In my application Serial No. 501,7 51, filed June 12, 1909, I have described a water tube boiler comprising substantially verti cal uptake and downtake manifolds each of which has an upward extension above the water line.

The present invention relates to a boiler of the type described in that application, the object being to provide means within the manifolds to effect the removal of the alts of lime and ma esia, er ether imfrom the fee posit of such impurities in the bottom of one blown out.

The usual method of operation of a boiler is to discharge the feed water directly into the boiler circulation, or to discharge it into the common steam space of the boiler where it becomes partially heated and then min gles freely with the boiler circulation, the result being that the separation of the contained impurities takes place largely within the tubes and is deposited on their internal surfaces as a hard scale.

In order to effect the purification of the feed water, accordingto the present invention, before its admission to the boiler circulation, it is necessary that .itbe heated and then conveyed to a settling chamber. The form of the manifolds described in my said application Serial No. 501,751 permits of "their utilization to efiect both of these operations. By reason of theirextension upwardly a heating s ace for the feed water separate from the boiler circulation is afforded in either or both manifolds, and into such space orspaces I introduce means for the requisite heating of the feed water. By

a vertical partition in the downtake mani-1 fold a settling chamber is provided, so that the water may be heated and then allowed to remain in a quiescent state a sufiicient length of time and 'under favorable con ditions for the separation of im rities. The water is passed from the settling chamwater, and the decomparatively ber through an opening of ample area for a slow movement lnto the circulatory system free from scale-forming mat ter. The purification of the feed water by the present invention comprises, therefore, the heating of the water and the separation of the impurities therefrom within the boiler structure but separate from the circulation, and will be understoodfrom the following description. I

In the accompanying drawings, forming a part of the specification, Figure 1 is a side view partly in section of aboiler, the fur nace and boiler setting being omitted; Fig. 2 a horizontal section on ,the plane of the line 2-2 of Fig. 1; and Fig. 3 a diagram matic view' of a modification, and Fig. 4 a section on the plane of the line H of Fig. 1.

Similar reference numerals indicate similar parts in the several views.

Referring to the drawings, the numeral '1 designates the uptake manifold, 2 the downtake manifold, 3 the bank of inclined tubes expanded into the manifolds and forming the heating surface, and l the substantially horizontal circulation tubes through which mingled steam and water from the tubes 3 pass from the uptake to the downtake manifold completing the cycle of. circulation. Both manifolds are substantially cylindrical and extended abovethe water line, established by the. circulating tubes to provide steam drums or chambers separate and distinct from the boiler circulation. These chamberscontain means for heating the feed water and delivering it to the boiler circulation as follows; In the uptake manifold.

the drum or chamber is formed by a partition 5 extending across the manifold above;

the water line, said partition having an opening or openings 6 to admit boiler steam to the chamber. Into the chamber thus formed is admitted a feedwater supply pipe 7 which is turned upwardly and dis charges in proximity to the dome of the manifold. Any suitable spraying or dis: tribiitingmeans may be employed to sub divide the water and to bring it into intimate contact with the steam. As shown, I provide a plate 8 upon whichthe incoming water falls and beneath said platea series of plates .9 supported in any suitable manner and preferably, increasing downwardly in diameter. The plates 9 are comparatively shallow so that the water will be spread outa wall 11 extending from the'base to above,

the water line, thus forming two chambers 12 and 13, the former of which is the downtake discharge for the boiler circulation, and the latter a quiescent sediment chamber for the feed water and into which the pipe 10 discharges. Below the discharge opening of said pipe is arranged an inclined plate 14 from which the water falls} To increase the rapidity of heating there is placed on top of the plate 14 corrugated wire netting, or similar material, which will cause a roughening of the surface of the water and provide metal parts whichl project into the live steam for conveying heat into the body of flowing water. The vertical partition wall 11 is provided with an opening 15- and from the upper edge of said opening a lateral wall 16 is projected into the chamber '13. The opening 15 is comparatively large in area to prevent any disturbance of the water in its passage through it- Substantially all of the supply to the water of circulation will pass through this opening, it being, in fact, the feed connection to the boiler proper. The sediment chamber 13 is made convergent downwardly by means of a wall 17, and from the bottom of said chamber leads a blow-off connection 18. A blowofl:' connection 19 leads from the circulation chamber on the opposite side of the wall 11.

The sediment chamber 13 is separated from the steam chamber in the upper part of the downtake manifold by a horizontal wall 20 'extendin from -the partition wall 11 and is provide with an opening or openings 21 to equalize the steam pressure inthe two chambers. Pipe 10 has an enlarged section to allowbf the settlement of such matter as is precipitated from the water during its passage through the pipe, the sediment being drawn ofl through a pipe 22.

"The operation will be readily understood from the foregoing description. The inctming feed water is 'dischar ed through the pipe 7 and flows over the p ates 8 and 9 onto the partition 5, through pipe 10 into cham'; ber 13, receiving" heat throughout its entire passage. The inflowing water is min led with that in chamber 13 which has a gra ual downward movement to the o ening 15. The water in chamber 13, being in a quies- "cent state, will permit the settlement of any solid particles in suspension, and the clarified Water to pass into the circulation. The sediment will collect in the converging bottom of the manifold and may be blown ofi' through pipe 18. The settling chamber has a common water line with the boiler water chamber 23 formed by partition walls 24:-

and 25. Instead of extending the artition wall above the water line as in ig. 1, I divide the downtake manifoldbya partition 26 which terminates below the water line,

" and the feed water isdischarged into the sediment chamber 13 through a pipe 27 forming the outlet from chamber 23 and extending downwardly to the lower part of the sediment chamber. In this form the water passes from the sediment chamber up wardly over the top of the vertical partltlon wall 26 into the boiler circulation.

What I claim and desire to secure by Letters Patent of the United States is 1. A water tubeboiler comprising a manifold for the reception of water-heating tubes, said .manifold having a chamber formed therein, means for admitting feed water to said chamber and for heatin therein, and means for conveyingthe eed water away from said chamber tothe boiler circulation.

2. In a water tube boiler, a manifold for the reception of water heating tubes, 881d manifold having a steam chamber above the water line, a feed water supply connecting with said steam chamber, means for'receiving the incoming water so arranged asto presentfa large and thin surface of over-flow water to the steam, and means for conveying the feed water away from said chamber to the boiler circulation.

3. In a water tube boiler a manifold for the reception of water-heatlng tubes, a partition across said manifold above the water line to form a chamber in the'upper part of the manifold, -means for admitting feed water to said chamber and for heatin "it therein, and means for conveying the eed water from said chamber to the boiler circu latiop. 4. In a water tube boiler, a manifold for the reception oitvater-heati-ng tubes, a partition across said manifold above the water line toform a chamber in the up er part of the manifold, means for admitting feed water and boiler steam to said chamber to heat the feed Water, and means for convey ing the feed water from said chamber to theboiler. circulation.

5. In a water-tube boiler, a manifold for the reception of water-heating tubes, a partition across said manifold above the Water line forming a chamber in the upper art of the manifold, means for admitting eed water andboiler steam to said chamber, and a distributing surface in said chamber to cause the steam to contact with the feed water. I I

6. In a water tube boiler, uptake and downtake manifolds having. steam chambers above the water line, means for admitting feed Water to the steam chamber of the uptake manifold, and a pipe connecting said chambers to deliver the feed water to the downtake manifold.

7. In a water tube boiler, uptake and downtake manifolds, partitions in said manifolds to form chambers separating them from the circulatory portions of the manifolds, means in both chambers for heating feed water admitted, thereto; a tube connect i the reception of Water-heating tubes, a partition dividing said manifold into'separate chambers, one for the circulation and the other for a quiescent water reservoir, and meansfor admitting water from the latter to the former chamber.

for admitting feed water thereto, apartition in said manifold to form a'settlin chamber pipe for manifold for heating the incoming lfeed.

water, means for conveying the water from the uptake to the downtake manifold, means for "further heating the Water in the-down take manifold, and a settling chamberin the I downtake manifold separate and distinct from the water circulatloni '12. In a water tube boiler, uptake and downtake manifolds each having an upward extension above the water line to form a steam chamber, means for admitting feed water into and heating the same in the chamber of the uptake manifold, a tube connecting said chambers above the water line, a partition in the downtake manifold to form a quiescent chamber for the feed water, and means. for admitting the feed water from said last-named chamber to the boiler circulation.

13. A water tube boiler 'comprisingamanifold for the reception of water-heating tubes, means for admitting water to said manifold and heating the same separate from the boiler circulation, means for causing the separation of the impurities from the heated Water, and means for conveying Water to the boiler circulation after the separation of the impurities therefrom.

14. In a water tube boiler, uptake and downtake manifolds both having water heating chambers therein separate from the circulation, means for conveying the water from the uptake heating chamber to the downtake heating chamber, a partition 'dividing the downtake manifold intofchambers one of which serves as a settling chamber, and means for admitting the water fromthe latter to theboiler circulation.

15. In a water tube boiler. a manifold having a substantially closed chamber in its upper part, a partition extending downwardly from said chamber and separating the manifold into two substantially vertical spaces in one of which is contained water of circulation and the other feed water, said partition having an opening so conformed as to direct the feed water in its downward 9. In a water tube boiler, a manifold for the reception of water-heating tubes, means course away from the partition and in its through said opening into the space containing the boiler circulation. r v 16. In a Water tube boiler, a manifold hav-' 'ing a partition separating it into two spacesin one of which the feed water is substan: tially quiescent, and the other of which is open to the boiler circulation, both of said spaces being within the manifold into which the heating tubes are expanded and in which there exists the same water level and the common pressure due to theboiler.

17. In a water tube boiler, amanifold having a partition separating it into two spaces upward course close to the partition and in ions of which the feed water is s'ubstantially quiescent, and the other of which is open to the boiler circulation, means for introdueing the feed water into the lower part of the quiescent chamber, and means for admitting thewater from said chamber to the circulation at a point above thepoint of admission of the feed. waterinto the quiescent chamber. 1

a; ssaQoao 18. In a water tube boiler, amanifqhihev signed my name in the presence of two sub- .ill l'g tgvo separate chafmbershone li? which scribing witnesses. i 0 am ers is separate rom t e boi er circulation and the lower part of which is made MI-NOTT SEWALL' 5 convergent, and a blow-off pipe at the bot- Witnesses:

' tom of said chamber. 1 CHARLES S. JONES, I In testimony whereof I have hereunto M. E. MONINGH. 

